Heres my first thought on how you might be able to do pin out on a 'sandwich a cpu between 2 heatsinks design'. 1) DRAM gets integrated with the cpu. Slight th

Heres my first thought on how you might be able to do pin out on a 'sandwich a cpu between 2 heatsinks design'. 1) DRAM gets integrated with the cpu. Slight thickness increase, probably quite a bit of added width. We get a bigger area to cool, closer ram and no need for any memory pins. 2) Add power connections to the 2 cooling sides. Running power wires through the coolers shouldn't be an issue. 3) Run as many of the fastest PCIe lanes as you can out the 4 thin sides of the package. These end up handling ALL of the IO. Some downsides I can think of off the bat are cooking the ram chips and with so much density and heat not sure how well signal integrity would work out.